PAGAN
Category Contaminant modelling
Platform DOS
Status Public domain
Description PAGAN is a part of the performance assessment methodology developed for use by the U.S. Nuclear Regulatory Commission in evaluating license applications for low-level waste disposal facilities. The program is used as one candidate approach for analysis of the ground-water pathway. It has the capability to model the source term, vadose-zone transport, and aquifer transport of radionuclides from a waste disposal unit. It combines the two codes SURFACE and DISPERSE which are used as semi-analytical solutions to the convective-dispersion equation. This system uses menu driven input/out for implementing a simple ground-water transport analysis and incorporates statistical uncertainty functions for handling data uncertainties. The output includes a time- and location-dependent radionuclide concentration at a well in the aquifer, or time- and location-dependent radionuclide flux into a surface-water body. It uses a simple modeling approach to which the convective-dispersion equation is applied. The model for releases from a disposal unit is based on a cascade mixing cells including leach mechanisms that can be used to analyze either surface contaminated wastes or diffusion controlled releases.
Data formats supported None stated
Supplier in France  OECD Nuclear Energy Agency 

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